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This is a simple Tic Tac Toe project implemented (mostly) in Groovy (in fact it is a so called Groovlet). The project can be build and executed with Gradle.

You may simply check out the project from GitHub and run the command

This will load all necessary stuff from the Internet, compile everything and start a Jetty Servlet Engine on localhost (Port 58080, Context /tictactoe-web).

Now you can connect your browser to http://localhost:58080/tictactoe-web/simple.groovy and see what happens.

The application understands a number of commands as HTTP Get Requests. Simply use the URL encoded CMD parameter, e.g. http://localhost:58080/tictactoe-web/simple.groovy?CMD=HELP:

• HELP: Print the help text
• RESET: Start new Board
• DESTROY: Start new Session
• SHOW: Show the current Board
• SET: Set a stone to a field given by two additional parameters
  • coordinate: One of A1, A2, A3, B1, B2, B3, C1, C2, C3
  • value: Either x or o
    e.g., http://localhost:58080/tictactoe-web/simple.groovy?CMD=SET&coordinate=A2&value=x

The simple.groovy implementation only provides restricted error handling, it only checks whether

• a CMD is valid
• a field is already occupied
• a coordinate is valid
• a stone value is valid

Per default the simple implementation returns a single line with the Board (only used fields with their contents) or an error or other status. Only for the HELP command you will see some more lines. If the optional parameter FORMAT is set to HTML the result is sent in very simple HTML code (please, don’t validate!).

Since the implementation is Groovlet (the Groovy variant of Java Servlets) based, it make use of a JSESSIONID cookie to allow for multiple users to play a game on their own.

Currently there is only the simple.groovy implementation which just provides a Board and only checks that there is only one stone on a field – Nothing else!
Feel free to improve and implement other variants, e.g.,

• HTML pretty printer which will draw a nice 3×3 playground
• Forms or JavaScript to place stones
• Computer player
• URL encoded session handling
• Socket variant
• Plain Java
  …

The implementation has been tested on different runtimes:

• Jetty, as mentioned above
• Tomcat (local WAR)
• CloudBees (WAR deployed to local test environment)
• CloudBees (WAR deployed to CloudBees Run@CLOUD environment, if you are lucky you may still find it running on http://tictactoe.aschemann.cloudbees.net/simple.groovy)